2 Copyright (C) 2012-2014 Carl Hetherington <cth@carlh.net>
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
20 #include "sound_mxf_writer.h"
21 #include "sound_mxf.h"
22 #include "exceptions.h"
23 #include "dcp_assert.h"
24 #include "compose.hpp"
29 struct SoundMXFWriter::ASDCPState
31 ASDCP::PCM::MXFWriter mxf_writer;
32 ASDCP::PCM::FrameBuffer frame_buffer;
33 ASDCP::WriterInfo writer_info;
34 ASDCP::PCM::AudioDescriptor audio_desc;
35 ASDCP::AESEncContext* encryption_context;
38 SoundMXFWriter::SoundMXFWriter (SoundMXF* m, boost::filesystem::path file, Standard standard)
40 , _state (new SoundMXFWriter::ASDCPState)
42 , _frame_buffer_offset (0)
44 _state->encryption_context = m->encryption_context ();
46 /* Derived from ASDCP::Wav::SimpleWaveHeader::FillADesc */
47 _state->audio_desc.EditRate = ASDCP::Rational (_sound_mxf->edit_rate().numerator, _sound_mxf->edit_rate().denominator);
48 _state->audio_desc.AudioSamplingRate = ASDCP::Rational (_sound_mxf->sampling_rate(), 1);
49 _state->audio_desc.Locked = 0;
50 _state->audio_desc.ChannelCount = _sound_mxf->channels ();
51 _state->audio_desc.QuantizationBits = 24;
52 _state->audio_desc.BlockAlign = 3 * _sound_mxf->channels();
53 _state->audio_desc.AvgBps = _sound_mxf->sampling_rate() * _state->audio_desc.BlockAlign;
54 _state->audio_desc.LinkedTrackID = 0;
55 _state->audio_desc.ChannelFormat = ASDCP::PCM::CF_NONE;
57 _state->frame_buffer.Capacity (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
58 _state->frame_buffer.Size (ASDCP::PCM::CalcFrameBufferSize (_state->audio_desc));
59 memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
61 _sound_mxf->fill_writer_info (&_state->writer_info, standard);
63 Kumu::Result_t r = _state->mxf_writer.OpenWrite (file.string().c_str(), _state->writer_info, _state->audio_desc);
64 if (ASDCP_FAILURE (r)) {
65 boost::throw_exception (FileError ("could not open audio MXF for writing", file.string(), r));
70 SoundMXFWriter::write (float const * const * data, int frames)
72 DCP_ASSERT (!_finalized);
74 for (int i = 0; i < frames; ++i) {
76 byte_t* out = _state->frame_buffer.Data() + _frame_buffer_offset;
78 /* Write one sample per channel */
79 for (int j = 0; j < _sound_mxf->channels(); ++j) {
80 int32_t const s = data[j][i] * (1 << 23);
82 *out++ = (s & 0xff00) >> 8;
83 *out++ = (s & 0xff0000) >> 16;
85 _frame_buffer_offset += 3 * _sound_mxf->channels();
87 DCP_ASSERT (_frame_buffer_offset <= int (_state->frame_buffer.Capacity()));
89 /* Finish the MXF frame if required */
90 if (_frame_buffer_offset == int (_state->frame_buffer.Capacity())) {
91 write_current_frame ();
92 _frame_buffer_offset = 0;
93 memset (_state->frame_buffer.Data(), 0, _state->frame_buffer.Capacity());
99 SoundMXFWriter::write_current_frame ()
101 ASDCP::Result_t const r = _state->mxf_writer.WriteFrame (_state->frame_buffer, _state->encryption_context, 0);
102 if (ASDCP_FAILURE (r)) {
103 boost::throw_exception (MiscError (String::compose ("could not write audio MXF frame (%1)", int (r))));
110 SoundMXFWriter::finalize ()
112 if (_frame_buffer_offset > 0) {
113 write_current_frame ();
116 if (ASDCP_FAILURE (_state->mxf_writer.Finalize())) {
117 boost::throw_exception (MiscError ("could not finalise audio MXF"));
120 MXFWriter::finalize ();